/*
 * Copyright 2006-2008 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.martinimix.dao.order;

import net.martinimix.domain.order.Order;


/**
 * Provides an interface allowing order information to be provided
 * by an external entity.
 * 
 * @author Scott Rossillo
 *
 */
public interface OrderDataProvider {

	/**
	 * Returns the tax rate for the given order.
	 * 
	 * @param order the <code>Order</code> whose tax rate
	 * should be returned 
	 * 
	 * @return the tax rate (percentage) for the given <code>order</code>
	 */
	public double calculateTaxRate(Order order);
	
	/**
	 * Returns a unique external order number.
	 * 
	 * @return a unique external order number or
	 * <code>null</code> if no external order number
	 * is desired
	 */
	public String createExternalOrderNumber();
	
	
}
